Methoximinopenteneones



United States Patent METHOXIMINOPENTENEON'ES Seymour L. Shapiro, Hastings on Hudson, and Louis Freedman, Bronxville, N.Y., assiguors to US. Vitamin Corporation, New York, N.Y., acorporation of- Delaware No Drawing. Application April'9, 1958 Serial No. 727,261

7 Claims. (Cl. 260-3405) This invention is concerned with aryl substituted 4- methoximinopenta-1-ene-3-ones of the formula wherein R and R are substituents on. the benzene. ring alike and difierent, and are selected from the group consisting of hydrogen, hydroxy, alkoxy, alkyl, halogen and acetamido, and those structures wherein R plus R is methylenedioxy.

The compounds" of this. invention have valuable pharmacological: properties: particularly as anti-inflammatory agents and as anticholinesterase: agents. They are also. useful as chemical intermediates in addition, oxidation, reduction and polymerization reactions.

Thus, for example, by reaction with amines XYNH, compounds of the type shown R: N i) NO CH which are a-(2-keto-3-methoximino-butyl)-N,N substituted benzyl amines may be obtained.

The compounds of this invention have two double bonds and are capable of existence as cis and trans forms at the C C double bond, and as syn and anti forms at the C, N double bond. While ultraviolet absorption spectra measurements suggest that the disposition about the C C double bonds has the larger groups trans, the group disposition about the C N double bond is not certain. It is intended, therefore, that the various stereoisomers of the compounds be considered within the purview of this invention.

The compounds of this invention are made by condensation of the suitably substituted aromatic aldehyde with 2,3-butane-dione-2-methoxime in an organic solvent, suitably, a lower alcohol, in the presence of an alkaline catalyst.

In the preferred embodiment of this invention, substantially equimolar amounts of the aromatic aldehyde and the 2,3-butane-dione-2-methoxime are reacted in ethanol or methanol, using sodium methoxide as a catalyst. The reaction proceeds satisfactorily at ambient temperatures. After a suitable reaction period which will vary with the aromatic aldehyde, ranging from several minutes to several days, the product is obtained by filtration from the reaction mixture, or by dilution of the reaction mixture with water and separation of the formed product.

The following examples are given to illustrate the present invention, but are not to be considered as limiting. Temperatures when shown are in C.

Example 1 A solution of 6.0 g5 of piperonal (0.04 mole) and 4.6 g. (0.04 mole) of 2,3-butane-dione-2-methoxime in 25 ml. of ethanol was treated with. 5 ml. of sodium methoxide in methanol. Within a few moments a yellow precipitate had formed. After standing 24 hours, the reaction mixture was diluted with 100 ml. of water 5 and 8.75 g. of 1-(3',4-methylenedioxyphenyl) 4-meth- Example 2 of 1.-(pracetamidophenyl)r4-methoxirninopenta-1 ene-3- 15 one, M.P. 181-182 (butyl acetate).

Analysis.Calcd. for C H N O C, 64.6;1-1, 6.2; N, 10.8. Found: C, 65.4; H, 6.6;.N, 11.0.

Example 3 In a similar'manner, using anisaldehyde as. the aromatic 2O aldehyde, a 0.04 mole run yielded 9.9 g. of 1-(p-methoxyphenyl)-4-methoximinopenta-1-ene-3-one, M.P. 55-56 (acetonitrile-water mixture).

Analysis.-Calcd. for C H NO C, 66.9; H, 6.5; N, 6.0. Found: C, 66.7; H, 7.0; N, 5.9.

Example 4 In a similar manner using 3,4-dimethoxybenzaldehyde as the aromatic aldehyde, a 0.04 mole run yielded 11.2 g. of l-(3',4'-dimethoxyphenyl)-4-methoximinopenta-l-ene- 39 3-one, M.P. 102-104 (isopropyl alcohol- Analysis.-Calcd. for C H NO C, 63.9; H, 6.5; N, 5.3. Found: C, 63.8; H, 6.7; N, 5.2.

Example 5 In a similar manner using 2,4-dimethoxybenzaldehyde 49 N, 5.3. Found: C, 63.8; H, 6.9; N, 4.8.

Example 6 In a similar manner using 2,3-dimethoxybenzaldehyde as the aromatic aldehyde, a 0.04 mole run yielded 6.5 g.

of 1-(2',3'-dimethoxyphenyl)-4-methoximinopenta-l-ene- 3-one, M.P. 7980 (methanol).

Analysis.Calcd. for C H NO C, 63.9; H, 6.5; N, 5.3. Found: C, 64.1; H, 6.4; N, 5.1.

50 Example 7 In a similar manner using o-methoxybenzaldehyde as the aromatic aldehyde, a 0.04 mole run yielded 7.35 g. of l- (o-methoxyphenyl) -4-methoximinopenta-l-ene-3-one, M.P. 74-75 (hexane).

Analysis.--Calcd. for C H NO C, 66.9; H, 6.5; N, 6.5. Found: C, 61.0; H, 6.5; N, 5.8.

In a similar manner, the corresponding derivatives from benzaldehyde, p-tolualdehyde, p-chlorobenzaldehyde, p-bromobenzaldehyde, 4-ethoxy-3-methoxy-benzaldehyde and the like may be prepared.

Example 8 A solution of 4.88 g. (0.04 mole) of m-hydroxybenzaldehyde and 4.6 g. (0.04 mole) of 2,3-butanedione-2- methoxime in 25 ml. of ethanol was treated with 9.5 m1.

1 (m hydroxyphenyl) 4 methoximinopenta 1 ene- 3-one, which weighed 6.4 g. separated. On recrystallization from heptane, the product melted at 123-124,

essence R, o NOCH;

wherein R is selected from the group consisting of hydrogen and methoxy, and R is selected from the group consisting of hydrogen, lower alkoxy, lower alkyl, hydroxy and acetamido, and those structures wherein R plus R is methylenedioxy.

2. The compound H O NO CH;

3. The compound 01130 4. The compound OCH;

NOCH;

5. The compound O ILBOCH, no

6. The compound 7. The method of preparing a compound of the formula @CH=GHCCCH3 E, ii ilro CH;

which comprises reacting an aromatic aldehyde of the formula wherein R is selected from the group consisting of hydrogen and methoxy, and R is selected from the group consisting of hydrogen, lower alkoxy, lower alkyl, hydroxy and acetarnido, and those structures wherein R plus R is methylenedioxy, with a substantially equivalent quantity of 2,3-butanedione-2-methoxime in a lower alcohol in the presence of lower alkoxide as an alkaline catalyst, and recovering the formed product.

No references cited. 

1. THE COMPOUND OF THE FORMULA
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